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   &#160;<span id="projectnumber">6.2.0</span>
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<div class="PageDoc"><div class="header">
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<div class="title">What's new in Qwt 6.2 </div>  </div>
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<div class="contents">
<div class="toc"><h3>Table of Contents</h3>
<ul><li class="level1"><a href="#PLATFORM">Qt &gt;= 4.8</a></li>
<li class="level1"><a href="#Class">Includes</a></li>
<li class="level1"><a href="#POLAR">QwtPolar has become part of Qwt</a></li>
<li class="level1"><a href="#MATHML">MathML Text Renderer has become its own project</a></li>
<li class="level1"><a href="#SPLINES">Spline</a></li>
<li class="level1"><a href="#OPENGL">Better OpenGL support</a></li>
<li class="level1"><a href="#ITEMS">New plot items</a></li>
<li class="level1"><a href="#CURVE">QwtPlotCurve</a></li>
<li class="level1"><a href="#SPECTROGRAM">QwtPlotSpectrogram</a></li>
<li class="level1"><a href="#OTHERS">Other changes</a></li>
</ul>
</div>
<div class="textblock"><h1><a class="anchor" id="PLATFORM"></a>
Qt &gt;= 4.8</h1>
<p>Support for Qt &lt; Qt 4.8 has been dropped, support for Qt6 has been added.</p>
<h1><a class="anchor" id="Class"></a>
Includes</h1>
<p>Include files, that match the class names are available now. So it is possible to write "#include &lt;QwtPlot&gt;" now instead of "include qwt_plot.h"</p>
<h1><a class="anchor" id="POLAR"></a>
QwtPolar has become part of Qwt</h1>
<p>The QwtPolar project ( <a href="https://qwtpolar.sourceforge.io">https://qwtpolar.sourceforge.io</a> ) has been integrated into Qwt.</p>
<h1><a class="anchor" id="MATHML"></a>
MathML Text Renderer has become its own project</h1>
<p>The code can be found at <a href="https://github.com/uwerat/qwt-mml-dev">https://github.com/uwerat/qwt-mml-dev</a> now and is intended to become a standalone lib.</p>
<h1><a class="anchor" id="SPLINES"></a>
Spline</h1>
<p>The broken implementation of <a class="el" href="class_qwt_spline.html" title="Base class for all splines.">QwtSpline</a> has been replaced by a bunch of classes offering all sort of functionalities around splines.</p>
<p>The most popular spline approximation/interpolation algos have been implemented: </p><pre class="fragment">- Basis
- Cardinal
- ParabolicBlending
- Akima
- The one used in a proprietory office package
- Cubic
</pre> <h1><a class="anchor" id="OPENGL"></a>
Better OpenGL support</h1>
<p><a class="el" href="class_qwt_plot_open_g_l_canvas.html" title="An alternative canvas for a QwtPlot derived from QOpenGLWidget.">QwtPlotOpenGLCanvas</a> added to support rendering to a QOpenGLWidget</p>
<h1><a class="anchor" id="ITEMS"></a>
New plot items</h1>
<pre class="fragment">- QwtPlotVectorField
  A new type of plot item for vector fields

- QwtPlotGraphicItem
  An item displaying a QwtGraphic image ( f.e used by QwtPlotSvgItem )
</pre> <h1><a class="anchor" id="CURVE"></a>
QwtPlotCurve</h1>
<pre class="fragment">- QwtPlotCurve::FilterPointsAggressive
  A fast weeding algo for huge datasets with increasing x or y values

- QwtPlotCurve::closestPoint
  Is virtual now

- Line Clipping
  Includes the painter clip now

- QwtValuePointData
  A new type of data added, where the x values are the index

- QwtPlotCurve::setSamples
  more type of setters
</pre> <h1><a class="anchor" id="SPECTROGRAM"></a>
QwtPlotSpectrogram</h1>
<pre class="fragment">- QwtPlotSpectrogram::setColorTableSize
  Using individual RGB tables

- QwtRasterData::setInterval/interval
  API cleanup

- QwtHueColorMap, QwtSaturationValueColorMap
  New type of color maps

- QwtMatrixRasterData::BicubicInterpolation
  Implementation of bicubic interpolation added

- Handling of NaN values
  NaN values are interpreted as gaps, when QwtRasterData::WithoutGaps
  is not set
</pre> <h1><a class="anchor" id="OTHERS"></a>
Other changes</h1>
<pre class="fragment">- QwtPlotRenderer
  Using QPdfWriter instead of QPrinter, where possible

- Handling of Unknown Paint Engines
  Not aligning unknown paint engines ( f.e EMF ), QwtNullPaintDevice is not using
  QPaintEngine::User anymore

- QwtTransform::LogMin/LogMax
  LOG_MIN/LOG_MAX have been reomed ( values differ ! 

- qwt_compat.h
  Removed

- qwtFuzzyGreaterOrEqual/qwtFuzzyLessOrEqual
  Removed

- qwtGetMin/qwtGetMax
  Removed
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